叶黄素
新黄嘌呤
光合作用
园艺
生物
光系统II
光抑制
紫黄质
化学
植物
叶黄素
玉米黄质
类胡萝卜素
作者
Anoma Dongsansuk,Cornelius Lütz,Gilbert Neuner
出处
期刊:Photosynthetica
[Institute of Experimental Botany]
日期:2013-03-01
卷期号:51 (1): 13-21
被引量:39
标识
DOI:10.1007/s11099-012-0070-2
摘要
The effect of a wide range of temperatures (-15 and 60°C) in darkness or under strong irradiation [1,600 µmol(photon) m -2 s -1 ] on quantum yield of photosystem II photochemistry and xanthophyll cycle pigments was investigated in a tropical fruit crop (Musa sp.) and a temperate spring flowering plant (Allium ursinum L.).In darkness within the nonlethal thermal window of A. ursinum (from -6.7 to 47.7°C; 54.5 K) and of Musa sp.(from -2.2°C to 49.5°C; 51.7 K) maximal quantum yield of PSII photochemistry (F v /F m ) was fairly unaffected by temperature over more than 40 K.At low temperature F v /F m started to drop with ice nucleation but significantly only with initial frost injuries (temperature at 10% frost damage; LT 10 ).The critical high temperature threshold for PSII (T c ) was 43.8°C in A. ursinum and 44.7°C in Musa sp.Under strong irradiation, exposure to temperatures exceeding the growth ones but being still nonlethal caused photoinhibition in both species.Severity of photoinhibition increased with increasing distance to the growth temperature range.ΔF/F m ´ revealed distinctly different optimum temperature ranges: 27-36°C for Musa sp. and 18-27°C for A. ursinum exceeding maximum growth temperature by 2-7 K.In both species only at temperatures > 30°C zeaxanthin increased and violaxanthin decreased significantly.At nonlethal low temperature relative amounts of xanthophylls remained unchanged.At temperatures > 40°C β-carotene increased significantly in both species.In Musa sp.lutein and neoxanthin were significantly increased at 45°C, in A. ursinum lutein remained unchanged, neoxanthin levels decreased in the supraoptimal temperature range.In darkness, F v /F m was highly temperature-insensitive in both species.Under strong irradiation, whenever growth temperature was exceeded, photoinhibition occurred with xanthophylls being changed only under supraoptimal temperature conditions as an antiradical defence mechanism.
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